Phase transition and water incorporation into Eu2Sn2O7 pyrochlore at high pressure

Zhang, F. X.; Lang, M.; Ewing, R. C.

doi:10.1016/j.cplett.2016.03.016

Title: Phase transition and water incorporation into Eu₂Sn₂O₇ pyrochlore at high pressure

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Abstract

Structural changes of europium stannate pyrochlore, Eu₂Sn₂O₇, have been investigated at high pressures with in situ Raman spectroscopy, photoluminescence (PL), and synchrotron X-ray diffraction (XRD) techniques. The XRD measurements suggest that a pressure-induced phase transition starts at 34.4 GPa. The PL spectrum from Eu³⁺ cations also suggests a phase transition above 36 GPa. XRD analysis shows that the unit cell of the cubic phase deviates from the equation of state at pressures above 23.8 GPa. Lastly, this is due to the incorporation of water from the pressure medium in the structure at high pressures, which is confirmed by optical spectroscopy measurements.

Authors:

Zhang, F. X. ^[1]; Lang, M. ^[2]; Ewing, R. C. ^[3]

Univ. of Michigan, Ann Arbor, MI (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Stanford Univ., Stanford, CA (United States)

Publication Date:: Thu Mar 10 00:00:00 EST 2016

Research Org.:: Univ. of Michigan, Ann Arbor, MI (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP)

OSTI Identifier:: 1289954

Alternate Identifier(s):: OSTI ID: 1336831

Grant/Contract Number:: NA0001977

Resource Type:: Accepted Manuscript

Journal Name:: Chemical Physics Letters

Additional Journal Information:: Journal Volume: 650; Journal Issue: C; Journal ID: ISSN 0009-2614

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE

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                    Zhang, F. X., Lang, M., and Ewing, R. C. Phase transition and water incorporation into Eu2Sn2O7 pyrochlore at high pressure.  United States: N. p., 2016. 
Web.  doi:10.1016/j.cplett.2016.03.016.

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                    Zhang, F. X., Lang, M., & Ewing, R. C. Phase transition and water incorporation into Eu2Sn2O7 pyrochlore at high pressure.  United States.  https://doi.org/10.1016/j.cplett.2016.03.016

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                    Zhang, F. X., Lang, M., and Ewing, R. C. Thu .  
"Phase transition and water incorporation into Eu2Sn2O7 pyrochlore at high pressure".  United States.  https://doi.org/10.1016/j.cplett.2016.03.016.  https://www.osti.gov/servlets/purl/1289954.

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@article{osti_1289954,

  title        = {Phase transition and water incorporation into Eu2Sn2O7 pyrochlore at high pressure},

  author       = {Zhang, F. X. and Lang, M. and Ewing, R. C.},

  abstractNote = {Structural changes of europium stannate pyrochlore, Eu2Sn2O7, have been investigated at high pressures with in situ Raman spectroscopy, photoluminescence (PL), and synchrotron X-ray diffraction (XRD) techniques. The XRD measurements suggest that a pressure-induced phase transition starts at 34.4 GPa. The PL spectrum from Eu3+ cations also suggests a phase transition above 36 GPa. XRD analysis shows that the unit cell of the cubic phase deviates from the equation of state at pressures above 23.8 GPa. Lastly, this is due to the incorporation of water from the pressure medium in the structure at high pressures, which is confirmed by optical spectroscopy measurements.},

  doi          = {10.1016/j.cplett.2016.03.016},

  journal      = {Chemical Physics Letters},

  number       = C,

  volume       = 650,

  place        = {United States},

  year         = {Thu Mar 10 00:00:00 EST 2016},

  month        = {Thu Mar 10 00:00:00 EST 2016}

}

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Title: Phase transition and water incorporation into Eu2Sn2O7 pyrochlore at high pressure

Abstract

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Title: Phase transition and water incorporation into Eu₂Sn₂O₇ pyrochlore at high pressure